The complex behaviour of a fuselage-cavity system in a modern propeller aircraft has been analysed with the finite element method. In the analysis the interaction between the fluid and the structure has been taken into account in a physical coupling formulation. The results obtained show that, at some frequencies, this coupling is very important for the vibroacoustic system response. The eigenfrequencies and eigenmodes of the fuselage-cavity found in the analysis are compared with experimental modal analysis on a mock-up of the aircraft. The agreement is very good from 10-130 Hz. Especially the modes with strong coupling are well pronounced in the experiments.
Finite element calculations of the interior noise of the Saab 340 aircraft
Finite Elemente Berechnung der Geraeusche im Inneren des Flugzeugs Saab 340
SAE-Papers ; Apr ; 1-16
1989
16 Seiten, 15 Bilder, 2 Tabellen, 4 Quellen
Conference paper
English
Finite Element Calculations of the Interior Noise of the Saab 340 Aircraft
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